. >> vice president joe biden continues his search for ways to curb gun violence. he is heading to virginia tomorrow. he will hold a rally to promote gun control and will hold online google forum chats to discuss the issue. >>> san mateo county will hold a gun buy-back event this saturday at the fairgrounds on delaware street. the county will offer $100 for handguns, shotguns and rifles. if you turn in an assault weapon you could earn up to $200. in recent months several bay area cities have held gun buy- back programs. this is oakland's successful event last december. >>> new this morning, british officials warning of an imminent threat against westerners in libya and telling all uk nationals to get out of benghazi immediately. meanwhile secretary of state hillary clinton got emotional yesterday when asked about the deadly attack on the u.s. consulate there. >> i put my arms around the mothers and fathers the sisters and brothers sons and daughters and the wives left alone to raise their children. >> the senate and house foreign relations committee grilled her for